The graphic co



@uiten tetes @anni @Hire F. GOY, 0F BOSTON, MASSACHUSETTS. i Laim PatentNo. 69,544, dated october' s, 1867.

IMPROVEMENT IN TURNING-LA'IHES.

To ALL WHOM 1T MAY o pNoEnN;

Be it known that I; F. W. CoY, of Boston, in the county of Suffolk, andState of Massachusetts, have made new and useful-Improvements inLsthesSpindles; and I do hereby declare that the following is a full andexact description thereof; reference being had to the accompanyingdrawings and to the letters of reference marked thereon. i

The nature of my infvention consists in so hanging the belt-wheel of uturning-lathe that it shell have a bearing independent of the spindle,so that the weer caused by the tension of the belt shall not aifeet thespindle of the lathel y i Toenable .others skilled Ain the art tomakeand nsemy invention, I will proceedi'to describe its construction anduse. In 'the drawings- Figure I is a. perspective view.

Figure 2 is an end elevation of the belt-Wheel.

Figure 3 is alongituriinul vertical section of-my improved spindle.

I construct the head-block in substantially the form shown in figs. 1and 3. B is a spindle, made slightly conical, and fitting snugly intothe head-block A. D is aanged ca-p, which is securely fastened to theend of the spindleB by means of the set-screw S. C C is the belt-wheel,which has for its journal the part H H' of the head-block A, turned andfitted for tha-t purpose, ns shown in g. 3. Two round recesses, E E, aremade in the rear face of this beltwheel,into which set the heads of thebolts E E, fig. 3, Now, the heads of these bolts E E are perfectlycircular, but eccentric ilnrelation to their Shanks. i The Shanks of thebolts E E pnss through the flange of the cap D. and are secured inposition by means of nuts K K, as shown in figs'. 1 and 3. The object ofthe eccentric-heeded bolts E E are to so connect `the belt-wheel C withthe spindle that they must revolve together and yet allow ci'considerable'wear of the belt-wheel C upon its journal H H'withoutcausing any strain upon the spindle B.- The eccentric-heads ofy thebolts E E will turn so as to adapt themselves to the* eccentrcity causedby the wear of the belt-wheel C. The belt-wheel C becomes so worn as torevolve considerably out of true, and yet the spindle be perfectly trueto its centre. p

What I claim as iny 4invent-ion, and desire to secure byA LettersPatent, is

The combination and arrangement of` the beltnvheel C, the bearing H H,the cap D, and the spindle B, substantially as described and for thepurpose set forth. I

` F. W. COY.

Witnesses:

A. HUN BERRY, FRANK G. PARKEM

